Power control of a power converter

Abstract

The present disclosure relates to a method for power control of a power converter including controlling, with a first signal having a first duty cycle D 1 , a first active switching component in a switching unit of at least one branch; controlling, with a second signal having a second duty cycle D 2 , a second active switching component of the switching unit; determining a polarity of a monitored current through at least one inductive component coupled to the at least one branch; and adjusting the first duty cycle D 1 and the second duty cycle D 2 based on the determined polarity. The present disclosure also relates to a respective controller and system.

1 . A method for power control of a power converter comprising:
 controlling, with a first signal having a first duty cycle D 1 , a first active switching component in a switching unit of at least one branch;   controlling, with a second signal having a second duty cycle D 2 , a second active switching component of the switching unit;   determining a polarity of a monitored current through at least one inductive component coupled to the at least one branch; and   adjusting the first duty cycle D 1  and the second duty cycle D 2  based on the determined polarity.   
     
     
         2 . The method according to  claim 1 , wherein an activation period of the first signal and an activation period of the second signal are compared to a reference period T ref  to calculate the first duty cycle D 1  and the second duty cycle D 2 . 
     
     
         3 . The method according to  claim 1 , wherein the activation period of the first signal and the activation period of the second signal are set such that the first active switching component and the second active switching component are not conducting for a time range T dead . 
     
     
         4 . The method according to  claim 3 , wherein a first electrical component is arranged in parallel to the first active switching component and a second electrical component is arranged in parallel to the second active switching component, wherein during the time range T dead  the first electrical component and the second electrical component are configured to act as a current source or sink. 
     
     
         5 . The method according to  claim 3 , wherein during the adjusting the first duty cycle D 1  and the second duty cycle D 2  a ratio between the time range T dead  and a reference period T ref  is kept constant. 
     
     
         6 . The method according to  claim 3 , wherein during the adjusting the first duty cycle D 1  and the second duty cycle D 2  the time rangeT dead  is kept constant. 
     
     
         7 . The method according to  claim 1 , comprising iterating the determining a polarity of the monitored current and the adjusting the first duty cycle D 1  and the second duty cycle D 2 . 
     
     
         8 . The method according to  claim 1 , wherein by adjusting the first duty cycle D 1  and the second duty cycle D 2 , the first duty cycle D 1  is increased by the same amount as the second duty cycle D 2  is decreased or the first duty cycle D 1  is decreased by the same amount as the second duty cycle D 2  is increased. 
     
     
         9 . The method according to  claim 1 , wherein the periods of the first signal and the second signal are between 1 kHz and 25 kHz. 
     
     
         10 . The method according to  claim 1 , wherein the first active switching component and a second active switching component are at least one of an insulated-gate bipolar transistor, a metal-oxide-semiconductor field-effect transistor, a bipolar transistor or a thyristor. 
     
     
         11 . The method according to  claim 1 , wherein the power converter comprises or is at least one of an AC/AC, AC/DC, DC/DC, or DC/AC converter, in particular an active bridge converter, more particularly a dual active bridge converter. 
     
     
         12 . The method according to  claim 1 , comprising altering a phase shift based on at least two target phase shifts and adjusting the first duty cycle D 1  and the second duty cycle D 2  based on the altered phase shift. 
     
     
         13 . The method according to  claim 1 , comprising altering a period based on at least two target periods and adjusting the first duty cycle D 1  and the second duty cycle D 2  based on the altered period. 
     
     
         14 . A controller for power control of a power converter, comprising:
 a processor configured to:
 control, with a first signal having a first duty cycle D 1 , a first active switching component in a switching unit of at least one branch; 
 control, with a second signal having a second duty cycle D 2 , a second active switching component of the switching unit; 
 determine a polarity of a monitored current through at least one inductive component coupled to the at least one branch; and 
 adjust the first duty cycle D 1  and the second duty cycle D 2  based on the determined polarity. 
   
     
     
         15 . The controller according to  claim 14 , wherein the processor is configured to iterate the monitoring a current, the determining a polarity of the current and the adjusting the first duty cycle D 1  and the second duty cycle D 2 . 
     
     
         16 . A system comprising a controller according to  claim 14  and a power converter comprising a first active switching component and a second active switching component in a switching unit of at least one branch and at least one inductive component coupled to the at least one branch.